According to Dell, you will be able to run “all your favorite” Windows 8 apps on the Xbox One.
This was mentioned on the console’s listing on Dell’s online store:
“Consider the game officially changed. With all your favorite Windows 8 apps able to be run on and synced to your Xbox One, now your phone, desktop, tablet and TV can all give you a unified web and entertainment experience.”
There’s nothing official yet, but back in June, Steve Guggenheimer, corporate vice president of Microsoft’s Developer & Platform Evangelism, said that “if you want to know about how to get a head start about thinking about developing for Xbox One, the logical thing to do is go build Windows 8 applications.”